Journal of clinical monitoring and computing
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J Clin Monit Comput · Jan 1998
Comparative StudyThe application of a modified proportional-derivative control algorithm to arterial pressure alarms in anesthesiology.
We have developed an arterial pressure alarm system based on a modified proportional-derivative (PD) controller algorithm, and prospectively tested its ability to predict significant hypotensive episodes, defined as systolic arterial pressure < 80 mmHg, in comparison to conventional limit alarms. ⋯ An arterial pressure alarm system design based on a closed loop control algorithm offered improved perform ance over conventional limit alarms and in addition provided a graded output of severity of the hypotension.
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J Clin Monit Comput · Jan 1998
Comparative StudyTranscranial Doppler blood flow velocity versus 133Xe clearance cerebral blood flow during mild hypothermic cardiopulmonary bypass.
Transcranial doppler (TCD) is used during cardiopulmonary bypass (CPB) to assess cerebral emboli and to estimate cerebral perfusion. We sought to compare TCD middle cerebral artery blood flow velocity (Vmca) to 133Xe clearance cerebral blood flow (CBF) measurements during mild hypothermic CPB thus determining its utility in cerebral perfusion assessment. ⋯ These findings suggest that TCD Vmca is a relatively poor correlate of CBF during mild hypothermic CPB.